Hello All, I am using siphon for ios 6.0 and later. In this I have added tcp transport and I am registered. Now when I call a cellular number (PSTN No) I am getting this error at pjusa_make_call: Assertion failed: (mutex), function pj_mutex_lock, file ../src/pj/os_core_unix.c, line 1201. But its working fine with UDP trasnport. So please suggest me where i am mistaken? Thanks and regards Ashish Gour -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20141014/a112dc3a/attachment.html>